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Temperature dependent Cr3+ photoluminescence in garnets of the type X3Sc2Ga3O12 (X = Lu, Y, Gd, La)
Open accessAbstract
Abstract Broad band near-infrared (NIR) light sources have great potential, e.g., in optical communication and non-invasive medical imaging. Here we report the optical properties of X3Sc2Ga3O12 (X = Lu, Y, Gd, La) garnets doped with Cr3+ showing efficient 4T2 → 4A2 broad band NIR emission between 600 and 1000 nm. The chromium-doped garnets were investigated in view of their capability for blue to NIR conversion in high power phosphor converted LEDs (pcLEDs). Typical high power (In,Ga)N LEDs reach junction temperatures up to 450 K. Hence, the photoluminescence (PL) quenching temperature is a crucial parameter for on-chip phosphors. The Cr3+-doped garnets reveal very high quenching temperatures for the broad band NIR emission, ~ 700 K for Lu3Sc2Ga3O12, Y3Sc2Ga3O12, Gd3Sc2Ga3O12, and 450 K for La3Sc2Ga3O12. The high quenching temperatures are in line with a small Stokes shift (~ 2400 cm−1) and weak electron-phonon coupling. To gain further insight in the luminescence properties, low temperature photoluminescence measurements were done. The optical properties of Cr3+ ions in garnets were analyzed in terms of the crystal field strength, Racah parameters, and phonon coupling parameters. The suitability for application in pcLEDs for high power broad band NIR sources was confirmed by emission measurements of ceramic pellets upon blue LED excitation.
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Shannon, R. D. (1976) · Acta Crystallographica Section A · doi:10.1107/s0567739476001551 · Cited by 66,145
Cited by
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Zhao, F., Song, Z., & Liu, Q. (2022) · Laser & Photonics Reviews · doi:10.1002/lpor.202200380 · Cited by 490
Xu, X., Shao, Q., Yao, L., Dong, Y., & Jiang, J. (2020) · Chemical Engineering Journal · doi:10.1016/j.cej.2019.123108 · Cited by 386
Broadband Near‐Infrared Garnet Phosphors with Near‐Unity Internal Quantum Efficiency
Basore, E. T., Xiao, W., Liu, X., Wu, J., & Qiu, J. (2020) · Advanced Optical Materials · doi:10.1002/adom.202000296 · Cited by 308
Blue LED-pumped intense short-wave infrared luminescence based on Cr3+-Yb3+-co-doped phosphors
Zhang, Y., Miao, S., Liang, Y., Liang, C., Chen, D., Shan, X., Sun, K., & Wang, X.-J. (2022) · Light: Science & Applications · doi:10.1038/s41377-022-00816-6 · Cited by 294
Metadata
- Authors
- Malysa, B., Meijerink, A., & Jüstel, T.
- Venue
- Journal of Luminescence
- Publisher
- Elsevier BV
- Published
- 2018-10
- Volume
- 202
- Pages
- 523-531
- ISSN
- 0022-2313 (ISSN-L)
- OpenAlex
- W2807616496
- Cited by
- 295
- References
- 1
- FWCI
- 5.87
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Malysa, B., Meijerink, A., & Jüstel, T. (2018). Temperature dependent Cr3+ photoluminescence in garnets of the type X3Sc2Ga3O12 (X = Lu, Y, Gd, La). Journal of Luminescence. https://doi.org/10.1016/j.jlumin.2018.05.076
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